Key term
Edexcel GCSE Combined Science Physics 1SC0
Key Concepts of Physics
Motion and Forces
Topic overviewScalar and vector quantitiesExamples of vectors and scalars, and velocitySpeed, distance, time and distance-time graphsAcceleration and the equation v squared minus u squaredVelocity-time graphs and free fallMeasuring speed in the laboratory, and typical everyday speedsNewton's first law, and investigating force, mass and accelerationNewton's second and third lawsWeight, mass and gravitational field strengthCircular motion and centripetal forceInertial mass and momentumCollisions, and force as the rate of change of momentumReaction time, stopping distance and large decelerationsFactors affecting stopping distance and reaction time
Conservation of Energy
Waves
Light and the Electromagnetic Spectrum
Topic overviewProperties of electromagnetic wavesInvestigating refraction in glass blocksThe groups of the electromagnetic spectrumThe continuous spectrum, and what our eyes can detectAbsorption, transmission and the velocity of electromagnetic wavesHow radiation is generated, and why danger rises with frequencyHarmful effects of excessive exposure to radiationUses of electromagnetic radiation
Radioactivity
Topic overviewThe atom and the size of atomsIsotopes, atomic number and mass numberRelative masses and charges of subatomic particlesElectron orbits and energy levelsForming ions, and how the atomic model changedTypes of ionising radiationBackground radiation and detecting radioactivityAlpha, beta and gamma, and their penetrating powerBeta-minus and beta-plus decayEffects of decay on atomic number and mass numberBalancing nuclear equationsActivity and the becquerelHalf-life and the randomness of decayHalf-life calculationsThe dangers of ionising radiationSafety precautions, contamination and irradiation
Energy – Forces Doing Work
Topic overviewEnergy stores and energy transfer diagramsChanging a system's energy, and measuring work doneWork done and the energy changes it causesGravitational potential and kinetic energy calculationsDissipation and wasted energyPower as the rate of energy transferThe watt, and calculating efficiency
Forces and Their Effects
Electricity and Circuits
Topic overviewThe atom, and drawing circuit diagramsSeries and parallel circuitsPotential difference and the voltmeterEnergy transferred by moving chargeCurrent, charge and measuring currentResistance and the equation V = IRResistors in series and in parallelDesigning circuits to test componentsInvestigating resistance in circuitsCurrent-potential difference graphs for componentsLight-dependent resistors and thermistorsThe heating effect of an electric currentUses of the heating effect, and the equation E = IVtPower as energy transferred per secondCalculating electrical powerEnergy transfer in domestic devices, and power ratingsDirect and alternating currentAlternating current and the UK mains supplyLive and neutral wires, earthing and fusesFuses in the live wire, mains voltages and electrical dangers
Magnetism and the Motor Effect
Topic overviewMagnetic poles, permanent and induced magnetsUses of magnetic materialsThe magnetic field around a bar magnetPlotting compasses and the Earth's magnetic fieldThe magnetic effect of an electric currentSolenoids and electromagnetsThe motor effect and Fleming's left-hand ruleThe force on a conductor in a magnetic field
Electromagnetic Induction
Particle Model
Topic overviewKinetic theory and differences in densityCalculating density, and investigating itChanges of state and internal energySpecific heat capacitySpecific latent heat and thermal insulationInvestigating the specific heat capacity of waterGas pressure and the motion of particlesAbsolute zero and the kelvin scale
Electricity and Circuits
Resistors in series and in parallel
- 2 things to know
- Paper 6
Overview
Why series resistors add and parallel resistors reduce the total, two identical resistors in parallel, and calculations of current and potential difference in series circuits.
What you need to know
Answer each one before you reveal it.
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Key term
How is the total resistance of two resistors in series found?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Why does adding a second resistor in series increase the total resistance of a circuit?
Model answer
The charge has to pass through both resistors one after the other, so the total opposition is the sum of the two.
- 2
How is the total resistance of two resistors in series found?
Model answer
The two resistances are added together.
- 3
Why does connecting a second resistor in parallel decrease the total resistance?
Model answer
The extra branch gives the charge another path, so a larger current flows from the supply for the same potential difference.
- 4
Two 10 Ω resistors are connected in series. What is their combined resistance?
Model answer
The combined resistance is 10 Ω + 10 Ω = 20 Ω.
- 5
How does the total resistance of two identical resistors in parallel compare with the resistance of one of them alone?
Model answer
The total resistance is half the resistance of one of the resistors.
- 6
Why is the total resistance of a parallel combination always smaller than the smallest single resistance in it?
Model answer
Every extra branch adds another path for current, so the current from the supply is larger than the current through any one branch alone.
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